Machine for casting and preparing curved stereotype-plates.



MACHINE FOR CASTING AND PREPARING GURVED STBREOTYPE PLATES.

A.EGLL

AYPLIOATION FILED APR. 9, 1912.

Patented June 3, 1913.

UNITED s'rATEs PATENT ore-Ion ARNOLD: ten, for, iitatmii, easel-lav,Assam To men-miss s memes- I rennin! (Toni/rims- .i'. c. & in. DIETRICH)Ac'rrENGEsELLscHArr, or PLAUEN, GER- MANY;

machine Fon ciis'rmd Arvin supreme Gamma s'rnnno'rYrn-rinrias,

Specification of Letters l Patentl une 3, 1913,

names filed April 9, 1912. serial 110. $89,518.

To all whom it, haagg-Oncem:

Be it known that I, ARNOLD EGLI, a subject of the King of Prussia,residing at Plauen i. VogtL, in theKingdom of Saxony and German Empire,have invented certain new and useful Improvements in Machines forCasting and Preparing Curved Stereotype-Plates, of which the followingis a specification. v

My invention relates to certain improve-v ments in machines for castingand preparing curved stereotype plates, as illustrated and described inthe specification accompanying United States Letters Patent No. 998081and particularly to the conveyer device which is provided on themachinefor supplying the casting metal from the melt ing tank to themold or molds.

The object of my invention is to provide a cenveyer of that kind adaptedto operate either only as such for short periods of time or permanentlyas mixing (agitating), and conveyer mechanism alternately, or even onlyas mixing (agitating) mechanism so that when the tank is supplied withmetal in blocks, broken plates or the like, or the molten metal is at acomparatively low temperature the casting metal in the tank can be mixedand agitated in order to produce a more rapid melting and a uniform temperature in the melting tank and if it is desired to cast at the sametime my new construction allows of mixing or agitating the metal in thetank and at the same time feeding molten metal from the tank to the moldor molds. At times when the molten metal in the tank is very hot andmixing or agitating acts prejudically for that or any other reasons themixing or agitating op eration can be discontinued for any length oftime.

My invention is illustrated in the accompanying drawings in which theportion of the melting furnace with the conveyer device in the meltingtank is shown in sec tion in Figure 1. Fig. 2 is a fragmentarylongitudinal section through the bottom of the pump casing at rightangles to Fig. 1, while Fig. 3 is a section along line 33 in Fig, 2.

The mixing, agitating and conveying device consists of a feeding screw 1on a shaft 2 a casing 3 with preferably three outlets of which theoutletat near the screw is ldaptedto be closed by a slide 5 while at the. topthe outlet 6 communicates with the casting mold and the outlet 7branches off the outlet 6 as an overflow pipe, The slide 5 is connectedwith a lever 8 by means of a rod 9. Said lever is adapted to be turnedabout its pivot 10 by means of a handle 11. In the drawing the slide 5is shown in the open position and the lever arm with the handle 11 is inthe upper position. When the handle 11 is. depressed along its-sector 12the slide 5 is raised and the outlet 4: thereby closed. i

If the handle 11 occupies its lower position, that is to say, when theoutlet 4 is closed the metal fed from the tank 13 by the screw 1 .mustrise in the outlet 6 and when the mold is full, flow back into the tank13 through the overflow pipe 7. If

the handle 11, however, is in the upper p0- sition (Fig. 1) andthe'slide 5 is open, as shown, the metal fed by the screw 1 passesthrough the outlet or opening at back into the tank 13 whereby a mixingand agitating of the metal and a circulation in the tank is oduced Thedriving shaft 2 of the screw 1 is positively connected with the drivingshaft 14 of the motor 15 by means of a clutch 1'6 and intermediategearing such as the gear wheels 17, 18 and beveled gear wheels 19, 20.The said clutch is electrically operated by means of conductors 21provided with operating switches 22 and 23 which arrangementallows themixing and conveyer device to be operated only periodically forconveying the molten metal to themold as above described, the outlet 4having previously been closed. At other times the outlet at can be leftopen. In this case upon closing the electric circuit bymeans of theswitch 23, the screw 1 only acts as an agitator. If, in this case theslide 5 is raised and lowered periodically by means of the handle 11connected with lever 8 the device operates alternately as a mixer, oragitator, and a conveyer.

In order to render casting impossible. while the casting mold is open,the electric circuit includes a safety switch 24; which is automaticallyclosed when the casting mold is closed and ready for casting, but isopen and therefore interrupts the circuit when the casting lnold isopen.

What 1 claim is 1. In an apparatus for casting curved stereotypeprinting plates, a melting tank, a mold, a feed-screw for delivering themolten metal from said tank to said mold, a source of power foroperating sald feed-screw, a

clutch for operatively connecting said feedscrewwith said source ofpower, means for actuating said clutch, a casing inclosing saidfeed-screw and havingthree openings, one communicating with the mold,one acting as an overflow and one for admitting the molten metal to thescrew-casing.

2; In an apparatus for casting curved stereotype printing plates, amelting tank, a mold, a feed-screw for delivering the.molten metal fromsaid tank to said mold, a source of power for operating said feedscrew,a clutch for operatively connecting said feed-screw with said source ofpower, means for actuating said clutch, a casing inclosing saidfeed-screw and having three openings, one communicating with the mold,

one acting as an overflow and one for admitting the molten metal to thescrew-casing, a slide adapted to close said last mentioned opening,and'means for operating said slide.

In an apparatus for casting curved stereotype-printing plates, a meltingtank, a mold, a conveyer for delivering the molten metal from said tankto said mold, a source of power, an electric clutch for operativelyconnecting said conveyer with said source of power, an electric circuitincluding said clutch, a switch in said circuit for operating saidclutch and an automatic switch in said circuit, normally open, andadapted to be closed only on the closing of said mold.

In testimony whereof I have afiixed my signature in presence of twowitnesses.

ARNOLD EGLI. Witnesses:

WILI-IELM DUNKEL, ROBERT HEINRICH NIER.

Copies of this patent may be obtained for five cents each, hy addressingthe Commissioner of Patents.

Washington, D. C."

